linux-kernel - virtio indirect with lots of descriptors

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Message-ID: <CAPM=9tzTUuOjmicjKs+OWirLz6+oHKJgnHjKHAd7WLv8JGmKCA@mail.gmail.com>
Date:	Wed, 10 Jul 2013 11:46:03 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>, qemu-devel@...gnu.org
Subject: virtio indirect with lots of descriptors

Hi Rusty,

playing with my virtio gpu, I started hitting the qemu
error_report("Too many read descriptors in indirect table");

Now I'm not sure but this doesn't seem to be a virtio limit that the
guest catches from what I can see, since my host dies quite quickly,
when I'm doing transfers in/out of a 5MB object with an sg entry per
page.

Just wondering if you can confirm if this is only a qemu limitation or
if I should just work around it at a bit of a higher level in my
driver/device?

Dave.
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